Pickled Red Onions-a quick pickle

• 1 large red onion, thinly sliced
• 1/2 cup white vinegar
• 1/2 cup water
• 1 tbsp sugar
• 1 tsp salt
• 1/2 tsp black pepper
• 1/2 tsp mustard seeds (optional)

1. In a bowl, combine vinegar, water, sugar, salt, pepper, and mustard seeds (if using). 
2. Stir until sugar and salt are dissolved.
3. Place the thinly sliced onions in a jar or container.
4. Pour the vinegar mixture over the onions, making sure they are fully submerged.
5. Seal the jar and refrigerate for at least 1-2 hours before serving. 
6. For best flavor, let them sit overnight.